Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb99bcb02e4b862…

MALICIOUS

PDF

73.2 KB Created: 2021-02-15 13:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1567e0c75de1fe6d51af2466ef3fa635 SHA-1: 112e18a26f54c9f633ebff415c4cbc1370a2c500 SHA-256: bdb99bcb02e4b86209270f231dc14167a1319c8390f05c04fc93ddc5e79a86a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or redirection strategy. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and numerous external URLs points towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=ferrari+458+italia+price+2020 PDF link annotation
    • http://dimax-matrasy.ru/allianz_partners_sas_annual_reportm5g9c.pdfIn PDF document text
    • http://mesretly.xyz/juxuzomoweberofuk59lt6.pdfIn PDF document text
    • http://onesmall.space/sokuxalokadimufo02udj.pdfIn PDF document text
    • http://lotto-investclub.com/13436892038advbk.pdfIn PDF document text
    • http://tradebot.space/lowilarosefirap9leh.pdfIn PDF document text
    • http://shishkin-seed.xyz/15375804787vbdbz.pdfIn PDF document text
    • http://denizan.com/que_es_la_lactancia_materna_exclusiva_a_libre_demandao0ed9.pdfIn PDF document text
    • https://lifowedo.weebly.com/uploads/1/3/4/7/134707215/4275931b.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/zujugegexakogqjrc1.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/58755097031elubr.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/cuantificacion_de_proteinas_por_el_metodo_biuret4w8ta.pdfIn PDF document text
    • http://limons.space/iyonlama_enerjisi_grafik_sorularjvvk2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/ahsaa_sports_physical_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/3d_applications_of_pythagorean_theorem_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/bedingte_formatierung_excel_4_farben.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/45184458453.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/shayari_video_mp4.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 5384 bytes
SHA-256: cbf926886c1ed9a1fe19f5e9210a642da9ff50b61635bbee1219f456b247332e
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 11728 bytes
SHA-256: 4fa53ed5a53a2d32deabfa6e086051004313cd44cbddd89e8964e6666196fba3

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